EP1798443B1 - Transmission and vehicle seat with such a transmission - Google Patents

Description

EP 0 979 750 A2 , which is considered as the closest prior art, describes a vehicle seat with an adjustment device having a spindle and an associated spindle nut. The spindle is rotatably fixed to a first adjusting element of the adjusting device. The spindle nut is rotatably mounted in a second adjusting element, wherein the second adjusting element is mounted with the first adjusting element in the manner of a rail guide. The spindle nut forms with its outer shell a worm wheel, which is connected to a screw of a rotary drive. The arrangement serves to displace a vehicle seat fastened on the second adjusting element with respect to the first adjusting element, which is fixedly connected to a vehicle floor. Disadvantageously, the arrangement consists of a large number of individual parts which are to be arranged and fastened directly in the rail arrangement formed by the two adjusting elements. A possibly required repair therefore requires a great deal of effort.

US 4,802,374 describes an adjustment for a vehicle seat, in which such a spindle with a adjusting element forming a vehicle seat rail is rotatably connected. However, the spindle is mounted outside the rail guide, which is considered undesirable by vehicle manufacturers. Another seat adjustment with self-locking adjustment for vehicle seats is off DE 1 755 740 known. Also in this arrangement is a variety of components in addition to a rail guide.

An elaborately constructed gear arrangement for adjusting a vehicle seat is also off WO 02/070299 A1 known. In this arrangement, a complex designed gear is described, which should be able to absorb forces occurring in the event of an accident.

Out EP 1 068 093 B1 is a transmission, as shown in Fig. 3, for adjusting two mutually adjustable parts 60, 61, in particular vehicle parts of a Sitzverstelleinrichtung, a window or a sunroof known, the first of the parts 60 forms a fixed to a vehicle floor lower rail, in which a non-rotatable spindle 62 or a fixed rack is added. The gear 6 is seated on the spindle 62 and is adjusted when actuated along the spindle 62 back and forth. The gear 6 is received in a holder 63 which is displaced together with the second of the adjustable parts 61 back and forth. The holder 63 is fixedly connected to the second of the mutually adjustable parts 61, which forms an upper rail, which is adjustably connected to the lower rail. About a support plate 64, the upper rail is connected to other components of the vehicle seat. In addition, a drive 66 is fastened to the holding plate 64 via fastening elements 65, the drive shaft 67 of which is connected to a drivable screw of the gear 6.

The gear 6 consists of a worm wheel having a non-rotatable spindle nut for driving the spindle or a non-rotatable worm for driving the rack, a drivable worm for transmitting a driving force of the drive to the worm wheel and a transmission housing, the worm and the worm wheel receives stored and which is adjustably connected to the second of the adjustable parts 61 in the adjustment direction. The gear housing consists of a plurality, in particular of at least two fastened by means of connectors housing plates. By means of the connectors, the position of the housing plates is fixed to each other in all spatial direction, wherein the connectors are simultaneously formed as a supporting, the transmission forces receiving connection points. In the case of only two housing plates, the transmission housing consists of two L-shaped housing plates. In the case of at least four components, the transmission housing from at least two pairs of opposing disc-shaped housing plates, which is in any case an elaborate gear arrangement, which in addition to the actual housing parts makes a variety of other bearing elements or bearing support elements, such as washers required. In addition to the complex assembly of a variety of items is also disadvantageous that the tolerances of the individual items must be coordinated. The individual housing parts of such a transmission housing are welded together.

Also known is the provision of two individual pressure housing parts, which are equipped with a spindle nut, drive plates and bushings and a worm and associated bushings and then sealed by plastic deformation of connectors of the housing halves.

DE 36 40 197 A1 describes a drive device for an adjustable seat with a two-part housing. In each case two opposite walls of the housing in each case a bearing opening for receiving the shaft of a worm or a worm wheel is formed. In order to store the protruding from one end of the screw shaft, a lid is inserted in front of the opening, you have formed inside a bearing for receiving the shaft. It is in terms of storage of the worm wheel and the worm to a two-part housing, which is a main housing and the functionally mandatory lid is formed.

EP 0 992 711 A2 describes a gear housing for receiving a worm and a worm wheel, through which each passes a shaft. The two shafts are each mounted in two opposite bearings, wherein the bearings are formed by corresponding through holes through the opposite side walls. For inserting worm and worm in the housing this is formed in two parts, wherein the respective division line through the side walls passes centrally through the through holes. After inserting the shafts of the worm and worm wheel in the bearing portions of the lower housing part, the upper housing part is placed over and screwed.

DE 41 01 470 C1 describes an adjustment unit for vehicle seats with a housing in which a spindle nut and a threaded spindle are added. The housing is a two-part housing comprising a main housing part and a cover for closing the main housing part. For receiving a drive shaft, a bore is formed in a housing wall. The bore extends in the lateral direction in a slot shape to an outer wall, which can be closed by the lid. The width of the slot corresponds more than the width of the drive shaft and the width of the receiving portion for the drive shaft in its operating position. Incidentally, the housing is very complex and composed of a plurality of individual wall and bearing elements.

DE 37 25 158 C2 relates to a motorized seat for a motor vehicle, wherein a multi-part housing is shown with a worm and a worm wheel. For storage of worm and worm wheel a variety of different components is used. DE 37 26 801 C2 relates to a worm gear with a housing, wherein the housing is divided by a the drive axis containing and perpendicular to the drive axis dividing plane, so that by disassembly of the two housing parts, an opening for inserting worm and worm is formed. DE 35 19 058 C2 describes a seat adjustment for a motor vehicle seat with a complex structure housing for receiving a worm and a worm wheel. A shaft is mounted in a U-shaped receptacle, which is closed by a flat lid-shaped element to prevent slipping out of the shaft from the receptacle. DE 29 25 032 A1 relates to a drive unit for a seat adjustment with a multipart Housing for receiving a worm and a worm wheel. In particular, bearing elements which are accommodated as separate components in the housing parts serve to support shafts. DE 29 03 782 A1 relates to a Verstellgetriebeanordnung with a complex structure for receiving a worm and a worm wheel, which are accommodated in special bearing elements.

The object of the invention is to simplify a transmission for adjusting two mutually adjustable parts, in particular vehicle parts of a seat adjustment device. In particular, the required number of parts should be reduced and a simple assembly or replacement of transmission parts are made possible.

This object is achieved by a transmission for adjusting two mutually adjustable parts with the features of claim 1. The subject of claim 8 is a spindle or worm drive with such a transmission. The subject of claim 9 is a vehicle seat with such a transmission. Advantageous embodiments are the subject of dependent claims.

It is advantageous to use structurally identical drives for a left and a right seat rail, if the inserted screw and / or the inserted worm wheel is designed axially on both sides for insertion or for carrying out a drive shaft. Preferably, the connection of the drive shaft to the screw via a square socket, which is formed on both sides or passing through the screw.

Accordingly, a transmission for adjusting two mutually adjustable parts, in particular vehicle parts of a Sitzverstelleinrichtung, a window lifter or a sliding roof, wherein the first of the parts comprises a non-rotatable spindle or a fixed rack and wherein the transmission is formed with a worm wheel having a non-rotatable spindle nut for driving the spindle or a non-rotatable worm for driving the rack, with a drivable worm for transmitting a driving force to the worm wheel and with a gear housing which receives the worm and the worm wheel stored and which is adjustably connected to the second of the parts in the adjustment direction, wherein the transmission housing is formed of a one-piece body with a worm bearing and a worm wheel.

Preferred is a transmission in which the screw bearing in one or two opposite walls than in particular side walls of the gear housing, in particular in the upper side portion of the gear housing is formed and in the insertion of the screw has a screw bearing access opening, wherein the screw bearing access opening through the corresponding side wall to the bottom of the side wall and / or the transmission housing passes.

According to the invention, such a transmission is provided in which the worm bearing access opening or a section in the transition region between the worm bearing access opening and the worm bearing has a smaller distance than a diameter of a worm shaft of the worm.

Preferred is a transmission in which the worm wheel bearing is formed in one or two opposite walls, in particular below the upper-side worm, and has a Schneckenradlager Zugangöffnuhg, wherein the Schneckenradlager access opening through a corresponding side wall to the underside of the side wall and / or Transmission housing passes.

According to the invention, such a transmission, wherein the worm wheel bearing access opening or a portion in the transition region between the worm wheel bearing access opening and the worm wheel bearing has a smaller distance than a diameter of a worm wheel shaft of the worm wheel.

Preferred is a transmission in which the side walls are formed with the screw bearing between the side walls with the worm wheel. In a simple embodiment, the two walls between the end faces are formed by the side walls with the worm wheel bearing end faces of a housing and by the side walls with the worm bearing. In plan view, these four walls thus form. Side walls of a square or cuboid housing. But are also possible embodiments in which two of the opposite walls to the other two walls at an angle between a screw axis and a Schneckenradachse extend, the angle can theoretically be between 1 and 179 °.

Preferred is a transmission in which the side walls in the lower side portion of the gear housing are formed of spaced legs, the distances of two adjacent legs being sufficiently wide and / or worm bearing access openings for carrying out a worm wheel shaft as worm bearing access openings for performing worm shank access and / or worm wheel shank. or are dimensioned elastic enough.

Such a transmission is preferred with a housing closure part for closing the transmission housing on the underside, wherein the housing closure part fixes the legs together after insertion of the housing closure part. Can be implemented in particular such a housing closure part in the form of a comprehensive pan or in the form of a donated construction.

Preferred is a transmission with a housing closure part for closing the lower side of the transmission housing, wherein the Housing lock part, the worm wheel and / or the worm in the transmission housing supports the bottom.

A transmission is preferred in which at least one inner side wall has an introduction chamfer towards and towards the worm bearing access opening and / or towards the worm wheel bearing access opening.

Construction and assembly of such a transmission are accordingly advantageously simplified. In the simplest case, this is done by reducing to three components to be highlighted, namely a one-piece gear block as a gear housing, a worm and a spindle nut. The worm and the spindle nut can be used in a manner known per se, with the spindle nut in particular having a globoidal toothing with a cylindrical component. The gear block can be provided for example as a plastic injection molded part with correspondingly shaped receptacles for gear parts of the transmission in a simple manner and at the same time cost. The individual components, d. H. in particular worm and spindle nut are used on the corresponding receiving devices or feeders to their bearings in the gear block and rotatably mounted therein by snap or latching connection about their respective longitudinal axis. According to a preferred embodiment, a gear cover is snapped as Gehäuseyerschlus part from below into corresponding locking receptacles to secure the combination of worm and spindle nut in the gear housing.

Preferably, the use of such a very small dimensionable transmission between two seat rails as the relatively adjustable parts of a vehicle seat. In principle, however, the application can be implemented in various applications of worm gears.

Fig. 1

ein Getriebegehäuse mit eingesetzter Schnecke und eingesetztem Schneckenrad gemäß einem besonders bevorzugten Ausführungsbeispiel;

Fig. 1A

einen Schnitt durch eine solche Anordnung;

Fig. 2

die Elemente der Anordnung aus Fig. 1 in auseinandergezogener Darstellung; und

Fig. 3

schematisch einzelne Elemente eines Fahrzeugsitz-Gestells und einer Schienenführung mit einem Getriebe gemäß dem Stand der Technik.

An embodiment will be explained in more detail with reference to the drawing. It shows:

Fig. 1

a gear housing with inserted screw and inserted worm wheel according to a particularly preferred embodiment;

Fig. 1A

a section through such an arrangement;

Fig. 2

the elements of the arrangement Fig. 1 in an exploded view; and

Fig. 3

schematically individual elements of a vehicle seat frame and a rail guide with a transmission according to the prior art.

Fig. 1 and 2 show in assembled or exploded view of a transmission and its components according to a particularly preferred embodiment. An integral transmission housing 1 serves to receive both a worm 3 and a worm wheel 4. Optionally, the arrangement can be closed from the underside by a housing closure part 2 or a housing cover.

The gear housing 1 consists of an upper part 10, on the underside corner Beirre 11 or web-shaped arms are formed directed downwards. The spatial directions above and below are used here only for illustrative description, since the composite transmission is ultimately used in any spatial directions in a drive device.

For storage of the screw 3, the upper part 10 of the transmission housing 1 forms a receiving or screw space 12. The screw 3 consists in a manner known per se of a worm shaft 30 and a worm toothing 31, which is formed in the central central region of the worm shaft 30 around it. How this particular out FIG. 1A can be seen, preferably, both ends of the worm shaft 30 on a drive shaft receiving 32, which serves for fixing a drive shaft to the worm shaft 30, so that the screw 3 is set in rotation about its longitudinal axis X. A two-sided arrangement or a passing arrangement of a drive shaft receptacle 32 allows identical drives for a left and a right seat rail provide. One and the same drive is thus suitable to introduce a drive shaft 67 axially on both sides or pass. Preferably, the drive shaft receiving 32 is formed as a square socket on both sides or passing in the screw 3.

Before inserting the worm 3 into the worm space 12, annular bearing wafers 33 are preferably placed on the two worm shaft ends 30, which protrude from the worm 3 on both sides of the worm gearing 31. However, this is not absolutely necessary and can be omitted in the case of, for example, a globoid gearing with a cylindrical portion.

In two mutually opposite first side walls 13 of the screw space 12 forming upper part 1 of the gear housing 1 screw bearing 14 are formed. At least one of the screw bearings 14 is formed as a passage opening through the corresponding first side wall 13, to allow the passage of the corresponding screw shaft 30 and / or the drive shaft, which is secured thereto, through the first side wall 13. The open diameter of the screw bearing 14 is greater than a diameter d3 of the worm shaft 30. Preferably, however, as little as possible clearance is allowed.

For insertion of the screw 3 in the screw bearing 14 is in the two first side walls 13 each have a worm bearing access opening 15, which extends from the screw bearing 14 to the underside of the upper part 10 or the corresponding first side walls 13. This allows the screw 3 to be pushed from below into the screw bearing 14, with the ends of the screw shaft 30 being passed through the two corresponding screw-bearing access openings 15.

To hold the screw 3 in the screw space 12, the worm wheel 4 can be inserted into the gear housing 1 and stored in this so that the screw 3 is securely stored in the screw bearing 14 and supported by the worm wheel downwards according to a simple embodiment from below.

However, according to the preferred embodiment, the wall of the worm bearing access opening 15 has a transverse, d. H. in particular parallel to the screw axis X extending web as a holding web 16. An open distance d4 between the holding webs 16 on the two opposite walls of the worm bearing access opening 15 is smaller than the diameter d3 of the worm shaft 30. The wall of the gear housing 1 in the region of at least the worm bearing access opening 15 and / or the wall of the worm shaft 30 are made of an elastic material, which yields upon insertion of the screw 3 through the worm bearing access openings 15 in the screw bearing 14. After insertion of the worm shaft 30 above the or the holding webs 16 of the worm shaft 30 is rotatably mounted with its two ends in the screw bearing 14, wherein it is prevented at the bottom by the retaining webs 16 on slipping out of the screw bearing 14.

The worm wheel 4 has, in a manner known per se, a worm wheel shaft 40 which protrudes with its two ends from a worm gear toothing 41. The worm wheel 4 is formed to be a worm wheel Y to rotate, wherein the worm wheel Y at the same time forms the axis of rotation of a spindle nut 42. The spindle nut 42 is formed by an internal toothing of the worm wheel shaft 40 designed as a hollow shaft. The spindle nut 42 serves to receive a spindle, which in the use of the transmission in z. B. the guide rails of a vehicle seat with a correspondingly rotatably mounted in one of the rails arranged spindle is engaged. As the worm wheel 4 rotates, the worm wheel 4 is thereby moved back and forth along the stationary spindle. Together with the worm wheel 4, the gear housing 1, in which the worm wheel 4 is accommodated, is moved back and forth. The drive of the worm wheel 4 takes place via the worm 3 arranged on the upper side and a drive shaft, which is connected to the drive shaft receptacle 32 of the worm 3.

To insert the worm wheel 4, the gear housing 1 below the upper part 10 and below the worm space 12 has a worm gear 17. The worm wheel space 17 can be delimited by two or more mutually opposite closed walls or preferably by the four legs 11. Each two adjacent legs 11 thus form a second side wall 18. In each of these mutually opposite two second side walls 18, a worm wheel bearing 19 is formed. The diameter of these worm wheel bearings 19 is equal to or greater than an outer diameter d1 of the worm wheel shaft 40, so that the worm wheel shaft 40 is rotatably supported in the two worm wheel bearings 19 about the worm wheel axis Y.

To insert the worm wheel 4 into the worm wheel bearings 19, a worm wheel bearing access opening 20 is formed in the two second side walls 18. The Schneckenradlager access openings 20 extend from the two Schneckenradlagern 19 to the bottom of the two second side walls 18 and the underside of the gear housing 1, so that the worm wheel 4 from below with the Schneckenradschaft 40 is inserted through the worm wheel bearing access openings 20 at the top into the worm wheel bearing 19.

In order for the worm wheel 4 and the worm wheel shaft 40 to be supported downwardly in the worm wheel bearings 19, a distance d2 of the walls of the worm wheel bearing access openings 20 is preferably made slightly smaller than the outside diameter of the worm wheel shaft 40. The material of the wall of the Schneckenradlager-access openings 20 and / or the material of the Schneckenradschaftes 40 is so elastic that the Schneckenradschaft 40 can be inserted against the elastic force from below through the Schneckenradlager-access openings 20 in the worm wheel bearing 19 and after reaching the worm wheel bearing 19 is stored safely downwards by the reset walls in the worm gear bearings 19. To facilitate the insertion of the worm wheel shaft 40 in the worm wheel bearing access openings 20, these have a downwardly sloping and outwardly tapered wall as an introduction bevel 21.

Additionally or alternatively, a housing cover can be used as a housing closure part 2 from below into the transmission housing 1. The housing closure part 2 then forms a conclusion of the otherwise downwardly open worm wheel space 17. The top wall of the housing closure part 2 is preferably rounded in such a way that the worm space 17 forms sufficient space for the worm gear teeth 41 and that the two ends of the worm wheel shaft 40 store on correspondingly shaped bearing surfaces 22. For fixing the housing closure part 2 in the transmission housing 1, a locking closure known per se with, for example, corresponding latching elements can be formed on the legs 11 of the transmission housing 1. However, particularly preferred are bolt receivers 23 for receiving fastening bolts 24, wherein the bolt receivers 23 as through holes through both the legs 11 and a lateral Pass wall 25 of the housing closure part 2. The width of the lateral walls 25 preferably corresponds to the distance d2 of the walls of the worm wheel bearing access openings 20, so that the worm gear 17 is sealed to the second side walls 18 after insertion of the worm wheel 4. The worm wheel axis Y runs in particular in a direction perpendicular to the worm axis X, as is known per se.

According to an alternative embodiment, instead of a worm wheel 4 with an integrated spindle nut 42, a worm wheel 4 with a worm wheel shaft 40 can also be used, worm gear teeth being formed on the worm wheel shaft 40 in addition to the worm gear teeth 41. The worm toothing then serves to engage in the toothing of a rack, which is fixedly arranged in, for example, a rail fastened to the vehicle floor in order to move the gear housing 1 along the rack back and forth. In this case, the bottom of the transmission case 1 is opened downwardly to allow the engagement of the rack, whereby such a rack may pass through the worm wheel bearing access openings 20. In particular, such a rack can also serve as an abutment for the worm wheel 4, so that the constriction of the distance between the legs 11 and the walls of the worm wheel bearing access openings 20 need not be less than the size of the diameter d1 of the worm wheel shaft 40.

For example, the transmission housing 1 may be formed from a substantially cuboidal housing with an open bottom wall and from the bottom wall of four leading through the side walls Schneckenlager- or Schneckenradlager-access holes 15, 20, which leading up to the respective worm bearing 14 and worm wheel 19.

Instead of using resilient backing materials, elastic transition regions may also be formed, particularly at the level of the spiral rotor bearings 19 and the worm bearings 14, respectively, around the downward side walls of the worm wheel bearing access openings 20 and the worm bearing access openings 15 for sliding the worm wheel shaft 40 therethrough or the worm shaft 30 to spread apart temporarily.

As the material for the transmission housing 1, the worm 3 and the worm wheel 4 plastic is particularly preferred, since a simple production is made possible by injection molding. In principle, however, it is also possible to use other materials, in particular metal for the production of such transmissions.

Such a trained transmission of such a transmission housing 1 with a screw 3 and a worm wheel 4 is used for example in an arrangement according to FIG. 3 instead of the transmission 6 shown there. The spindle 62 is guided by the spindle nut 42. The drive shaft 67 of the drive 66 is connected to the drive shaft receptacle 32 of the worm shaft 30 of the worm 3. The driving of the drive shaft 67 by means of the drive 66 thereby leads to a rotation of the screw 3, which sets the worm wheel 4 in a corresponding rotation. As a result of the subsequent rotation of the spindle nut 42, the worm wheel 4 and, via its mounting in the worm gear bearings 19, the gear housing 1 is moved back and forth along the stationary spindle 62. Together with the transmission housing 1, the upper rail 61, which forms one of the adjustable parts, is adjusted by the support 63 relative to the lower rail 60, which forms the other of the adjustable parts, so that a seat fastened to the upper rail 61 projects relative to a vehicle floor - or is moved back.

According to an alternative embodiment, the worm wheel 4 can also be arranged as the upper toothed element in the gearbox housing 1 above the worm 3.

In particular, with an arrangement of the worm wheel 4 as the lower toothed element in the gear housing 1 with a guided spindle 62 can also be a down-closing storage for the Schneckenradschaft 40 accounts if the spindle 62, the worm wheel 4 and possibly via the worm wheel 4, the worm 3 relative to the transmission housing 1 down in the corresponding bearings 14, 19 holds.

LIST OF REFERENCE NUMBERS

1

gearbox

10

Top of 1

11

Legs / bridge-shaped arms of 1

12

auger

13

first side walls of 1

14

worm bearing

15

Worm bearing access openings

16

Haltesteg in 15

17

Schneckenradraum

18

second side walls of 1

19

worm gear bearing

20

Worm gear bearing access opening

21

Introductory bevel of 20

2

Housing closure / cap

22

Stock in 2 for 40

23

pin receptacles

24

mounting bolts

3

slug

30

screw shaft

31

Worm teeth

32

Drive shaft intake in 30

X

screw axis

4

worm

40

Schneckenradschaft

41

Worm wheel teeth

42

spindle nut

Y

worm wheel

d1

Diameter of 40

d2

Distance of opposite walls of the worm wheel bearing access openings 20

d3

Diameter of 30

d4

Distance of opposite walls of the worm bearing access openings 15

Claims (9)

1. A gear mechanism for the displacement of two parts (60, 61) capable of being displaced with respect to each other, in particular vehicle parts of a seat displacement device, a window winder or a sliding roof, wherein the first of the parts (60) [is] a rotationally fixed spindle (62) and wherein the gear mechanism is formed with

   - a worm gear (4, 41) which has a spindle nut (42) rotationally fixed thereto for driving the spindle (62),

   - a worm (3, 31) capable of being driven for transmitting a driving force to the worm gear (4, 41) and

   - a gear mechanism housing (1) which receives the worm (3) and the worm gear (4) in a mounted manner and which is capable of being connected in a non-displaceable manner to the second of the parts (61) in the displacement direction thereof, wherein

   - the gear mechanism housing (1) is designed with a worm bearing (14) and a worm gear bearing (19),

   - the worm bearing (14) is formed in two opposite walls (13) of the gear mechanism housing (1) and has a worm bearing access opening (15) in the insertion direction of the worm (3), and

   - the worm gear bearing (19) is formed in two opposite walls (18) of the gear mechanism housing (1) and has a worm gear bearing access opening (20),

   - the gear mechanism housing (1) is formed from a one-piece body with the worm bearing (14) and the worm gear bearing (19),

   - a drive shaft receiving means (32) is formed on the worm (3) on both sides or continuously in the axial direction thereof for the insertion or the passage of a drive shaft (67),

   - the worm bearing access opening (15) has a shorter distance (d4) than a diameter (d3) of a shaft (30) of the worm (3) and/or

   - the worm gear bearing access opening (20) has a shorter distance (d2) than a diameter (d1) of a shaft (40) of the worm gear (4).
2. A gear mechanism according to claim 1, in which the worm bearing (14) is formed in the portion on the top side of the gear mechanism housing (1) in two opposite walls (13) of the gear mechanism housing (1), wherein the worm bearing access opening (15) passes through the corresponding lateral wall (13) as far as the underside of the lateral wall (13) of the gear mechanism housing (1).
3. A gear mechanism according to a preceding claim, in which the worm gear bearing (19) is formed below the worm (3) on the top side in two opposite walls (18), wherein the worm gear bearing access opening (20) passes through a corresponding lateral wall (13) as far as the underside of the lateral wall (13) of the gear mechanism housing (1).
4. A gear mechanism according to a preceding claim, in which the lateral walls (13) with the worm bearing (14) are formed between the lateral walls (18) with the worm gear bearing (19).
5. A gear mechanism according to any one of claims 1 to 4, with a housing closure part (2) for closing the gear mechanism housing (1) at the bottom.
6. A gear mechanism according to a preceding claim, in which at least one lateral wall (13, 18) on the inside has an insertion slope (21) towards the worm bearing access opening (15).
7. A gear mechanism according to a preceding claim, in which the at least one drive shaft receiving means (32) is formed with the profile of an internal square in the worm (3).
8. A spindle or worm drive with a gear mechanism (1, 2, 3) according to a preceding claim.
9. A vehicle seat with a gear mechanism (1, 2, 3) according to a preceding claim.

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